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Portfolio Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - Non-Covered Loans - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | $ 26,047 | $ 24,343
Recorded Investment With No Allowance | 5,823 | 4,856
Recorded Investment With Allowance | 10,922 | 10,831
Total Recorded Investment | 16,745 | 15,687
Related Allowance | 4,453 | 2,579
Average Recorded Investment | 15,573 | 19,722
Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 21,893 | 20,750
Recorded Investment With No Allowance | 3,294 | 2,321
Recorded Investment With Allowance | 9,656 | 10,344
Total Recorded Investment | 12,950 | 12,665
Related Allowance | 4,266 | 2,508
Average Recorded Investment | 13,827 | 16,270
CRE - investor owned |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 553 | 560
Recorded Investment With No Allowance | 398 | 422
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 398 | 422
Related Allowance | 0 | 0
Average Recorded Investment | 277 | 521
CRE - owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 847 | 487
Recorded Investment With No Allowance | 472 | 0
Recorded Investment With Allowance | 336 | 487
Total Recorded Investment | 808 | 487
Related Allowance | 109 | 71
Average Recorded Investment | 691 | 490
Construction and land development |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 0 | 441
Recorded Investment With No Allowance | 0 | 136
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 0 | 136
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 331
Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 2,425 | 1,730
Recorded Investment With No Allowance | 1,659 | 1,602
Recorded Investment With Allowance | 618 | 0
Total Recorded Investment | 2,277 | 1,602
Related Allowance | 52 | 0
Average Recorded Investment | 778 | 1,735
Consumer and other |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 329 | 375
Recorded Investment With No Allowance | 0 | 375
Recorded Investment With Allowance | 312 | 0
Total Recorded Investment | 312 | 375
Related Allowance | 26 | 0
Average Recorded Investment | $ 0 | $ 375

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